A 49-year-old has died after an 'altercation' between four men at Category A Woodhill Prison.

Police have launched a murder investigation after three men, aged 33, 32, and 26 were arrested.

A Prison Service spokesperson said: "A HMP Woodhill prisoner was pronounced dead following an incident on Tuesday 5 June.

"It would inappropriate to comment further while there is an ongoing police investigation."

Police confirmed they were called a 3.23pm yesterday after reports of an incident at the prison.

Senior investigating officer, Detective Chief Inspector Ailsa Kent, of the Thames Valley Police Major Crime Unit, said: “We have launched an investigation into this incident, and are working alongside the Prison Service.

“Three arrests have been made as a result of the offence and these men are all in custody.

The Category A jail is on the outskirts of Milton Keynes and has housed some of the country’s toughest and most notorious criminals (Image: PA)

“The family of the victim is being supported by specially trained officers at this time.

“Our officers are at the scene as our investigation continues.”

Woodhill Prison, currently housing around 800 inmates, is a top security jail that has housed some of the country’s toughest and most notorious criminals.

The Category A jail, on the outskirts of Milton Keynes, Buckinghamshire, opened in July 1992 to cater for a mix of prisoners including high security crooks such as lifers, suspected terrorists and others facing charges of serious criminal or sexual offences.

In 1998, one wing was re-designated as a close supervision centre, which holds a small number of prisoners who are among the most difficult and disruptive in the prison system.